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Iskalni niz: "avtor" (Marin Ugrina) .

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Assessment of natural zeolite clinoptilolite for remediation of mercury-contaminated environment
Ivona Nuić, Mateja Gosar, Marin Ugrina, Marina Trgo, 2022, izvirni znanstveni članek

Povzetek: The soil at ancient roasting sites in the surroundings of the Idrija mine (Slovenia) is highly contaminated with mercury. To assess the impact of mercury on groundwater by infiltration and find an eco-friendly remediation method, the leaching of mercury from the soil containing 1347 mg Hg/kg, followed by sorption of the total leached mercury on cost-effective natural zeolite (NZ) clinoptilolite, was performed. The leaching of soil in ultrapure water of pHo = 3.00–11.46 after 24 h resulted in the total leached mercury concentration in the range 0.33–17.43 µg/L. Much higher concentrations (136.9–488.0 µg/L) were determined after the first few hours of leaching and were high above the maximum permissible level in water for human consumption. The NZ showed very good sorption of the total leached mercury, with a maximum removal efficiency of 94.2%. The leaching of mercury in presence of the NZ resulted in a significant decrease of the total leached mercury (1.9–20.3 µg/L compared to 12.8–42.2 µg/L), with removal efficiencies up to 90.5%, indicating immobilization of mercury species. The NZ has a great potential for economically viable remediation of mercury-contaminated environment. However, efforts should be made in the further study of mercury leachability to reduce the mercury concentration in water to acceptable levels.
Ključne besede: Idrija mine, mercury-contaminated soil and water, leaching, natural zeolite clinoptilolite, remediation
Objavljeno v DiRROS: 23.06.2022; Ogledov: 97; Prenosov: 44
.pdf Celotno besedilo (54,30 MB)

Preparation and characterization of the sulfur-impregnated natural zeolite clinoptilolite for Hg(II) removal fromaqueous solutions
Marin Ugrina, Martin Gaberšek, Aleksandra Daković, Ivona Nuić, 2021, izvirni znanstveni članek

Povzetek: Sulfur-impregnated zeolite has been obtained from the natural zeolite clinoptilolite by chemical modification with Na2S at 150 °C. The purpose of zeolite impregnation was to enhance the sorption of Hg(II) from aqueous solutions. Chemical analysis, acid and basic properties determined by Bohem’s method, chemical behavior at different pHo values, zeta potential, cation-exchange capacity (CEC), specific surface area, X-ray powder diffraction (XRPD), scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), as well as thermogravimetry with derivative thermogravimetry (TG-DTG) were used for detailed comparative mineralogical and physico-chemical characterization of natural and sulfur-impregnated zeolites.
Ključne besede: zeolit, klinoptilolit, živo srebro, onesnaženje okolja
Objavljeno v DiRROS: 03.03.2022; Ogledov: 157; Prenosov: 78
.pdf Celotno besedilo (6,88 MB)

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